For adolescents, risk of drug abuse increases greatly during times of
a. transition
b. divorce
c. changing schools
d. all of the above

D i need to keep writing cause has to be atleast 20 characters and because if you get divorce or leave school or go threw a transition you get depress and people mostly do drugs to forget stuff like that

Hmm...they are all reasonable choices for using drugs so I'd say D, because there could be a transition that the adolescent is facing, perhaps their parents are having a divorce, changing schools could also be a problem. So yeah I'd choose D.

What happens to the influenza virus every 20-40 years and why?